Designation:D4065−20StandardPracticeforPlastics:DynamicMechanicalProperties:DeterminationandReportofProcedures1ThisstandardisissuedunderthefixeddesignationD4065;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thispracticeisforgeneraluseingatheringandreport-ingdynamicmechanicaldata.Itincorporateslaboratoryprac-ticefordeterminingdynamicmechanicalpropertiesofplasticspecimenssubjectedtovariousoscillatorydeformationsonavarietyofinstrumentsofthetypecommonlycalleddynamicmechanicalanalyzersordynamicthermomechanicalanalyzers.1.2Thispracticeisintendedtoprovidemeansofdetermin-ingthetransitiontemperatures,elastic,andlossmoduliofplasticsoverarangeoftemperatures,frequencies,ortime,byfreevibrationandresonantornonresonantforcedvibrationtechniques.Plotsofelasticandlossmoduliareindicativeoftheviscoelasticcharacteristicsofaplastic.Thesemoduliarefunctionsoftemperatureorfrequencyinplastics,andchangerapidlyatparticulartemperaturesorfrequencies.Theregionsofrapidmodulichangearenormallyreferredtoastransitionregions.1.3Thepracticeisprimarilyusefulwhenconductedoverarangeoftemperaturesfrom−140°Ctopolymersofteningandisvalidforfrequenciesfrom0.01to1000Hz.1.4Thispracticeisintendedformaterialsthathaveanelasticmodulusintherangefrom0.5MPato100GPa(73psito1.5×107psi).1.5Discrepanciesinresultsareknowntoarisewhenob-tainedunderdifferingexperimentalconditions.Withoutchang-ingtheobserveddata,reportinginfull(asdescribedinthispractice)theconditionsunderwhichthedatawereobtainedwillenableapparentdifferencesobservedinanotherstudytobereconciled.Anassumptionofthistechniqueisthattestingisconductedintheregionoflinearviscoelasticbehavior.1.6Differentmodesofdeformation,suchastensile,bendingandshear,areused,aslistedintherefe...
